Concrete anchor.



H. J. SMITH.

CONCRETE ANCHOR.

APPLICATION FILED 1320,11, 1911.

1,089,874, Patented Mar. 10,1911

UNITED STATES PATENT oEEioE.

HARRY J'. SMITH, 0F LAKEWOOD, OHIO, ASSIGNIOR TO TH'E HILL CLUTCHCOMFANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

CONCRETE ANCHOR.

Specification of Letters Patent.

Application n led December 11, 1911.

Patented Mar. 10, 1914.

Serial No. 665,076.

ful Improvements in Concrete Anchors, of

which the following is a specification.

This invention relates to an anchor which is more particularly -designedfor fastening to concrete floors, walls or ceilings such articles ashangers, beams and machinery.

It is the object of't-his invention to produce anchors of this charactereconomically and of such construction as to permit of securely andconveniently fastening parts to concrete structures.

In the accompanying drawings :V Figure '.lV

is a vertical section showing my improved anchor applied to the concreteceiling of a building. Fig. 2 is a horizontal section in line 2 2, Fig.ll, with the concrete ceiling omitted. Fig. 3 is a side elevation of thebody of the anchor. Figs. 4 and 5 are top and bottom plan views of thebody of the anchor. Fig. 6 is a sectional elevation. of a moldin flaskillustrating the method of producing the body of the anchor andinclosing a screw nut therein.

Similar characters of reference indicate corresponding parts throughoutthe several views.

The anchorembodying my invention comprises generally 4a body 1 adaptedto be embedded in the concrete-wall, flooror ceiling of the building sothat the front, lower or outer end of the anchor is exposed' or Hushwith the surface of the concrete, a screw nut 2 arranged within thebody, and a bolt 3 en aging its threaded shank with the threade openingof the nut.

The body of the anchor is cast of metal and comprises a lower enlargedchamber 4 rovided on its underside or bottom with an inlet opening 5, acontracted upper chamber 6 opening at its lower end into the lowerchamber and arranged in line with the opening 5, internal stops orshoulders 7 arranged on the side wallof the lower chamber on op ositesides of the opening 5, and a plura ity of longitudinal ribs or wings 8arranged equidistant around the outer side of the upper and lowerchambers their outer edges 9 inclined or beveled so that together theyform a cone frustum. The lower enlarged chamber of the body and havingalso has the formof a downwardly tapering cone frustum but lthe uppercontracted chamber is preferably of cylindrical form, as shown 1n thedrawin s.

-The angle of the conical side wall of the lower chamber is' the same asthe angle of the beveled outer edges of the wings. 'lliis body icsembedded in the concrete while the latter is in a plastic condition withthe outer end of the body exposed or flush with the surface of theconcrete and after the latter i has set or become dry and hard the bodyis securely held in the concrete against turning or being pulled out,the turning being prevented by the wings and the adhesion or friction ofthe concrete and the pulling out being resisted by the adhesion orfriction of the concrete and the conical form of the lower chamber andthe beveled edges of the wings. The body is thus firmly and securelyanchoredI in the concrete and capable of safely supporting the heaviestloads likely to be attached to the body without liability of the bodybeing detached from the concrete.

The screw nut is arran ed within the enlarged chamber of the bo y withits opening in line with the inlet opening of this chamber and also inline with the contracted chamber. This nut fits loosely in the enlargedlower chamber but its diameteris greater than the upper chamber and saidinlet opening so that the nut is confined in the lower chamber.

For the purpose of preventing the screw nut from making more than apartial rotation about the axis its diameter is greater than thedistance between the stop shoulders 7 within the lower chamber.

The hanger beam or other part to be mounted on the concrete ceiling isfirst attached to the bolt 3 and then the latter is assed through theinlet openin of the ody and screwed into the threade openin of the, nut2 `until the part to be supporte on the concrete body is in the desiredposition. After'the attaching screw has passed through the screw nut thesaine enters the conti-,acted upper chamber of the anchor body whichprovides the necessary clearance 'space to permit the screw to 'passinto the anchor body as much as necessary. Upon turning the attaching,bolt the screw nut is prevented from turning more than a small extent byreason of the corners of the screw nut engaging with the stop shoulders7 within the'body7 thereby enabling the screw to pass through the nut`and be tightened.

ln order to permit the attaching bolt and the nut to tilt to a limitedextent and aline themselves to the direction of the pull of the boltwhen attaching a part to the concrete body the opening 5 in the body ofthe anchor is made somewhat larger in diameter than this bolt and isalso .flared outwardly or downwardly, as shown in Figs. l and 5, and thechamfered, beveled or rounded side of the nut is engaged with the bottomof the lower chamber, so as' to form a ball and socket joint between thebody and the bolt which insures a large bearing surface between the nutand anchor body and forms a reliable support for the load. By thuschamfering. the nut and flaring the inlet opening the bolt can alsofollow the nut through a considerable circular angle, thereby allowingfor bad setting of the anchor body in the concrete, also anyimperfections in the bolt hole of' a wooden beam, ironfoot of a hangeror other piece to be clamped to the concrete which does not exactlyregister with the anchor body and still permit the boltk to, be inclinedand find the nut for screwing these parts together.

It will be noted that by closing the cha-.mbers of the anchor body atthe top and sides and providing an opening for the bolt only at theunder or outer side thereof, the concrete and water is excluded from thein- .terior of these chambers and prevented from reaching the threads ofthe4 nut and bolt and interfering with assembling of the parts.

Various means may be employed for producing the anchor body with thescrew nut trapped or confined therein against displacement.

The method of casting the anchor body around the screw nut and the moldfor accomplishing this result are preferably as follows z-lO representsa core in which the nut 2 is embedded so as to be completely surroundedby the core. 11, 12 represent the cope and drag of the molding sand of aflask 13. The core l() is arranged between the cope and drag and theopposing sides therenosaswi of are constructed to form with said corethe mold cavitylt in which the body of the anchor is cast by pouring themetal into the same through the sprue 15. After this casting iscompleted the same is removed from the mold and the core removed fromthecasting leaving the V.screw nut confined loosely within the lowerenlarged chamber of the'anchor body and in position to receive thefastening bolt. The nut is thus permanently associated with the anchorbody and the latter is closed on all sides except at the front endthereof so that concrete and water can not interfere with the use of theanchor.

The anchor is not only very strong and durable in construction, but thesame can also`be produced at comparatively low cost and also permits ofinstalling machinery onconcrete bodies conveniently and expeditiously.

l claim as my invention:

l. A concrete. anchor comprising a hollow cast body having a lowerchamber, an upper chamber opening into the lower chamber and an openingarranged inthe underside of the body and in line with the upper chamber,and a screw n ut arranged in said lower chamber and constructed of suchsize as to prevent its removal from the lower chamber.

2. A concrete anchor comprising a hollow cast body having a lowerchamber, an upper chamber opening into the lower chamber and an openingarranged in the underside of the body and in line with the upperchamber, and a screw nut arranged in said lower chamber and constructedof `a size to prevent its removal from the lower chamber and said lowerchamber being provided with an internal stop shoulder which is engagedby the corners of said screw nut for preventing the latter from turningwithin the body.

, `Witness my hand this 7 th day of December, 1911.

HARRY J. SMlrlH.

W'itnesses B. H. CAMPBELL, l). A.. STRA'rroN.

